—Be quiet, Mr. Smith is coming.
—Don’t worry. It ＿＿＿ be him. Mr. Smith is much taller.
A.  mustn’t     B.    must   C.     can’t

－Dad, may I watch TV?
－No, you can’t. You _______ finish your homework first.
A. must     B. can      C. may  

You _________lose your way if you walk alone in the mountains at night.
A. may        B need          C. should          D. ought to

By the year 2015, all of China's museums will be free to enter. We_______visit anymuseum without paying.
A. can    b. need    C. must    D. should

—Peter doesn’t mind lending you his camera.
—He __________. I’ve already borrowed one.

—Dad，can I go to the movies tonight?
--Sure，but you__come back home before 9 o’clock.

—Hey, Ted! You _______ never play in the street. It’s not safe.
—Sorry, Mum. I won’t again.

----Dad, the bread is not enough. I am still hungry.    I have something more?
----But there’s nothing in the fridge now.

You ______ wear sports shoes when you climb a mountain.

—Let’s go dancing tonight.!
—Sorry, I ________.I have to go to my guitar lesson.
A. mustn’t              B. needn’t             C. can’t